For two years, a terrible war between Equestria and the Crystal Empire has ravaged the land and depleted resources. As King Sombra uncovers a mystical artifact in the crystal mines of his empire, his armies march on the bustling city of Manehattan, where Celestia's weakened forces make a desperate stand. Led by a foreigner recently appointed by Princess Celestia herself, they must hold out long enough for reinforcements to complete the trans-Celestial Sea voyage and turn the tide of the war once again to a unified Equestria.
Map used for Manehattan: http://djinn327.deviantart.com/art/Map-of-Manehattan-MLP-FIM-314396247
If I could get feedback, that would be amazing.